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Thursday, August 17, 2006

Another attempt at the Ger/CB/1906 "classic" version

I thought that I would try again (prompted by the order of designs in the Blue Book) to see if I could implement that "classic" version of the Ger/CB/1905. This was a very "edgy" design that did extreme shortening of the citadel to reduce the weight of protection. The 800ft length was intended to aid the achievement of the 33 knot speed. The armour basis is 4in and the deck is 3in. Turrets and barbettes are 6in. The armament is 8-12in/45 and 12-4in QF guns. There is a single tripod mast forward and only lightly armoured bridge structure. I experimented to use the heaviest machinery possible, which is still not very heavy. This is the Springsharp report:'
Ger/CB/1906 Original Concept, Germany Battlecruiser laid down 1905 (Engine 1917)

Displacement:
 23,871 t light; 24,781 t standard; 27,000 t normal; 28,775 t full load

Dimensions: Length overall / water x beam x draught
 800.00 ft / 800.00 ft x 85.00 ft x 25.60 ft (normal load)
 243.84 m / 243.84 m x 25.91 m  x 7.80 m

Armament:
      8 - 12.00" / 305 mm guns (4x2 guns), 864.00lbs / 391.90kg shells, 1905 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, evenly spread, 2 raised mounts - superfiring
      12 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1905 Model
   Quick firing guns in deck mounts with hoists
   on side, all amidships
 Weight of broadside 7,296 lbs / 3,309 kg
 Shells per gun, main battery: 90

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 4.00" / 102 mm 425.00 ft / 129.54 m 16.00 ft / 4.88 m
 Ends: Unarmoured
   Main Belt covers 82 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  1.00" / 25 mm 425.00 ft / 129.54 m 25.00 ft / 7.62 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 6.00" / 152 mm 4.00" / 102 mm  6.00" / 152 mm
 2nd: 4.00" / 102 mm 2.00" / 51 mm  2.00" / 51 mm

   - Armour deck: 3.00" / 76 mm, Conning tower: 2.00" / 51 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Direct drive, 4 shafts, 161,336 shp / 120,357 Kw = 33.00 kts
 Range 7,500nm at 15.00 kts
 Bunker at max displacement = 3,995 tons

Complement:
 1,053 - 1,369

Cost:
 £2.430 million / $9.718 million

Distribution of weights at normal displacement:
 Armament: 912 tons, 3.4 %
 Armour: 5,543 tons, 20.5 %
    - Belts: 1,180 tons, 4.4 %
    - Torpedo bulkhead: 393 tons, 1.5 %
    - Armament: 1,315 tons, 4.9 %
    - Armour Deck: 2,616 tons, 9.7 %
    - Conning Tower: 39 tons, 0.1 %
 Machinery: 5,914 tons, 21.9 %
 Hull, fittings & equipment: 11,502 tons, 42.6 %
 Fuel, ammunition & stores: 3,129 tons, 11.6 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   35,302 lbs / 16,013 Kg = 40.9 x 12.0 " / 305 mm shells or 3.8 torpedoes
 Stability (Unstable if below 1.00): 1.15
 Metacentric height 5.1 ft / 1.6 m
 Roll period: 15.8 seconds
 Steadiness - As gun platform (Average = 50 %): 65 %
   - Recoil effect (Restricted arc if above 1.00): 0.74
 Seaboat quality  (Average = 1.00): 1.30

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.543
 Length to Beam Ratio: 9.41 : 1
 'Natural speed' for length: 28.28 kts
 Power going to wave formation at top speed: 52 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): -2.00 degrees
 Stern overhang: -2.00 ft / -0.61 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  36.00 ft / 10.97 m
    - Forecastle (20 %): 29.00 ft / 8.84 m
    - Mid (69 %):  29.00 ft / 8.84 m (21.00 ft / 6.40 m aft of break)
    - Quarterdeck (15 %): 21.00 ft / 6.40 m
    - Stern:  21.00 ft / 6.40 m
    - Average freeboard: 27.08 ft / 8.25 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 126.2 %
  - Above water (accommodation/working, high = better): 230.5 %
 Waterplane Area: 47,140 Square feet or 4,379 Square metres
 Displacement factor (Displacement / loading): 109 %
 Structure weight / hull surface area: 159 lbs/sq ft or 776 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.98
  - Longitudinal: 1.24
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent
 Good seaboat, rides out heavy weather easily

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